| Autor: |
Stefan-Alexander Arlt, H. Wiechert |
| Rok vydání: |
1993 |
| Předmět: |
|
| Zdroj: |
Physical Review Letters. 71:2090-2093 |
| ISSN: |
0031-9007 |
| DOI: |
10.1103/physrevlett.71.2090 |
| Popis: |
Heat-capacity studies have been carried out on submonolayers of (CO${)}_{1\mathrm{\ensuremath{-}}\mathit{x}}$(${\mathrm{N}}_{2}$${)}_{\mathit{x}}$ mixtures physisorbed on graphite. We find that pure CO undergoes an end-to-end ordering transition at ${\mathit{T}}_{\mathit{c}}$=5.18 K, which is shown to belong to the two-dimensional Ising universality class. In diluting CO with ${\mathrm{N}}_{2}$ the heat-capacity peaks become progressively rounded until the phase transition is completely suppressed at a ${\mathrm{N}}_{2}$ concentration of only x=0.07. The analysis of the data shows that this behavior is in quantitative agreement with predictions of the random-field theory applied to adsorbed films. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
|
